Sienna and Sierra Bernal are identical twins - but Sienna is half the size of her twin sister Sierra. The blonde-haired, blue-eyed teens age 13 look so similar - but one sister has rare primordial dwarfism. Primordial dwarfism is so rare that that there are only 200 people in the world known to have the condition. Sienna is the only primordial dwarf in the world to have an average sized twin.

Sienna and Sierra Bernal are identical twins - but Sienna is half the size of her twin sister Sierra. The blonde-haired, blue-eyed teens age 13 look so similar - but one sister has rare primordial dwarfism. Primordial dwarfism is so rare that that there are only 200 people in the world known to have the condition. Sienna is the only primordial dwarf in the world to have an average sized twin.

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Walking with Giants Foundation.

Walking with Giants Foundation.

Kenadie, the Little Angel, has given inspiration to the entire world!! God bless her!! - Primordial Dwarfism Kenadie is adorable..

Kenadie, the Little Angel, has given inspiration to the entire world!! God bless her!! - Primordial Dwarfism Kenadie is adorable..

primordial+dwarfism | Sienna Bernal, Primordial Dwarf Twin

primordial+dwarfism | Sienna Bernal, Primordial Dwarf Twin

Unique: Charlotte was born with a form of Primordial Dwarfism so rare doctors don't even have a name for it

Unique: Charlotte was born with a form of Primordial Dwarfism so rare doctors don't even have a name for it

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